United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #:  9502220192

                         Boeing Computer Services
                         P.O. Box 24346
                         Seattle, WA 98124-0346

February 13, 1995
G-1151-RSO-95-079

Document Control Desk
United States Nuclear Regulatory Commission
Washington, D.C.  20555

BOEING

Reference:     a)   Boeing Letter G-1151-RSO-92-365 dated August 31,
                    1992; R. S. Orr to the NRC Operations Center

               b)   NRC Letter Docket No. 99901227 dated August 12, 1992;
                    L. J. Norrholm to R. S. Orr; Subject: Response to 10
                    CFR 21 Inquiry

Dear Sir or Madam:

In accordance with the reference correspondence and 10 CFR 21, Boeing is
sending the NRC the attached error notice(s) received from our former
software suppliers.  Because of unknown current addresses, the following
former customers were not notified:

     Reactor Controls, Inc.

     Echo Energy Consultants, Inc.

     Nuclear Applications and Systems Analysis Company (Japan)

     Nuclear Power Services

Error notices have been sent to our other former customers.

Very truly yours,


R. S. Orr
Nuclear Administrator
G-1151 M/S 7A-33
(206) 865-6248

Attachment(s): GTICES Program Report Form No. 95.02


Georgia Tech             Computer Aided Structural Engineering Center

                         Georgia Institute of Technology
                         School of Civil & Environmental Engineering
                         Atlanta, Georgia 30332-0355
                         USA
                         404-894-2260
February 3, 1995         404-894-8014 FAX


Attention:  Nuclear Administrator
Boeing Computer Services
P. O. Box 24346, M/S 7A-33
Seattle, Washington 98124-0346

RE:  GT STRUDL

Dear Sir or Madam:

Enclosed please find a copy of the GTICES PROGRAM REPORT FORM No. 95.02
and a VENDOR ACKNOWLEDGEMENT FORM.  Please sign and return the VENDOR
ACKNOWLEDGEMENT FORM to acknowledge receipt of the GTICES Program Report.

Thank you for reviewing the Program Report and for returning the
Acknowledgement Form.

Best regards,
CASE Center


Catherine Lee
Configuration Control Manager

CL/apw
Enclosures


                      GTSTRUDL Program Report Form

                                                       GPRF No.:

                                                       DATE:

FROM:     Computer-Aided Structural Engineering Center 
          Georgia Institute of Technology 
          Atlanta, Georgia 30332-0355

SEVERITY LEVEL:

     URGENT         Problem results in incorrect answers which may not be
                    apparent or job aborts and cannot be recovered within
                    the session or job.

     SERIOUS        Problem results in incorrect answers which are
                    obvious or problem prevents completion of a
                    particular user's task.

X    MINOR          Problem can be worked around or problem poses high
                    frustration factor.

     INFORMATIVE    Documentation error, program usage tip, user
                    inconveniences.


Date Problem Confirmed   February 3, 1995

Date Notification Sent

Computers   All

Operating System   All

Version   All 91.01 and later

Target Release for Correction   95.02


                                                  Manager, ASD
Signature                                    Title
R & D Division


     Michael H. Swanger
Typed or Printed Name                        Date of Signature


Signature                                    Title
Professional Services Division


Typed or Printed Name                        Date/of/Signature


                                                                 Rev. 2.2


                      GTSTRUDL Program Report Form
                               (Continued)

                                                       GPRF No.:

                                                           DATE:

DESCRIPTION:

The DAMPING RATIOS command given immediately prior to the ASSEMBLE FOR
DYNAMICS, DYNAMIC ANALYSIS EIGENVALUE, or DYNAMIC ANALYSIS MODE
SUPERPOSITION commands will prevent the computation and assembly of the
stiffness and mass damping matrices.  This condition will furthermore
result in the computation of 0.0 values for the modal damping ratios by
the COMPUTE MODAL DAMPING command.  The stiffness and mass damping ratios
are computed and assembled as a result of damping factor values specified
in any or all of the following commands:  CONSTANTS, JOINT RELEASES,
INERTIA OF JOINTS, DAMPING PROPORTIONAL.

The following sequence of commands illustrates this situation:

          DAMPING RATIOS 0.05 10

          ASSEMBLE FOR DYNAMICS   $ No damping matrices assembled
          PERFORM EIGENVALUE ANALYSIS

          DYNAMIC PARAMETERS
            RESPONSE DAMPING INPUT 1.0 STIFFNESS 1.0 MASS 1.0
          END

          COMPUTE MODAL DAMPING RATIOS   $ 0 damping ratios computed

Work-around:

     Position the DAMPING RATIOS command immediately before the COMPUTE
     MODAL DAMPING RATIOS command.

Applicable sections of the User's Manual:

     Specification of Damping Properties -- Section 2.4.3.4, Volume 3

                                                                 Rev. 2.2


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